Stress Corrosion Cracking in Marine Applications, especially Ocean Current Turbines must be overcome. Al-10Si-5Mg Alloy which is based on the nature of flexibility and strength, is expected to survive from the SCC. The purpose of this paper is to examine the indications of SCC from immersed specimens in the 3.5% NaCl Solution + Aquades solution, then give varying deflections on the 3 Point Bending Testing. The other tests are harness testing, tensile testing, and macro visualization. The method is experimental for Al-10Si material in addition to a 5% Mg at casting. There are 9 specimens, namely 3 specimens from each of the 3 load values, namely 252 MPa (deflection (y)=2mm), 378 MPa (y=3mm), and 504 MPa (y=4mm). The results provide evidence that when the specimens were submerged with varying stresses, the absence of broken material was obtained even though there were indications of cracking and corrosion. Then the specimen that gets a high stress, becomes more susceptible to fracture due to the predominant cracking effect when compared to low standing specimens (σy=4 mm < σy=3 mm < σy=2 mm). So by the resistance to SCC, the Al-10Si-5Mg alloy can be recommended as an Ocean Current Turbine Blade material.

Pico hydropower plant is a generator engaged in the field of renewable energy, in general, the power system uses a 3-phase synchronous generator with AC voltage, in its development it can be used as a converter, by converting AC voltage to DC voltage. One of the uses of DC voltage is as so that it can be used as a battery charger or battery discharger. An AC-DC converter, also known as a rectifier, is a device for converting alternating current (AC) to direct current (DC). In general, many technologies in the industrial world utilize converters. In this paper, a simulation design of an AC-DC converter system will be made with a 230 Volt AC input with a DC voltage output. The manufacture of the converter is carried out with different gate values on the thyristors which are simulated using Simulink in MATLAB. The results of this study are in the form of analysis and mathematical calculations of the output of the AC-DC converter where from the simulation results that AC voltage can be converted to DC voltage with the working principle of the thyristor, thus the converter output results can be used in battery chargers and battery dischargers

Electricity is now a primary need that is very important for everyday life, both for household use and in industry. Electricity supply should be spread evenly throughout Indonesia, therefore it is important to distribute electricity to Indonesia, especially the Nunukan area, North Kalimantan which until now is experiencing good development with the addition of diesel engine units that can help distribute electricity to the people of Nunukan. The purpose of this study was to determine the performance of the Mitsubishi engine with the S16R-PTA (-S) model. The method used was by conducting a literature study and taking data on the diesel engine and performing calculations so that the research that was carried out at the PLTD Sei Bilal obtained data to calculate the thermal efficiency and net work of a diesel engine. From the data obtained, calculations were made and concluded that at 600 kW power the highest thermal efficiency was 59.3% and at 800 kW and 1000 kW the highest net effort was 614.36 kJ/kg.

Kursi roda digunakan sebagai alat bantu disabilitas. Disabilitas memiliki kemampuan terbatas untuk menggerakkan sendiri kursi rodanya sehingga diperlukan sistem yang memudahkan pergerakan kursi roda. Tujuan penelitian ini adalah merancang sistem pemrograman dari software Arduino IDE dan mengetahui fungsi dari Arduino Uno terhadap kursi roda eletrik . Pemprograman arduino kemudian akan terkoneksi terhadap alat sistem elektrik yang menjadikan Kursi Roda dapat dikendalikan secara praktis. Penelitian ini menggunakan metode eksperimen dengan merancang system kursi elektrik menggunakan system berbasis arduino IDE (Integreted Development Environment). Proses perancangan sistem pemrograman dari software Arduino IDE dengan dirangaikan kepada komponen elektrik pada kursi roda diperoleh berupa program inisialisasi. Pemrograman dari arduino IDE (Integrated Development Environment) menjadi dasar kendali yang dikontrol oleh joystick. Joystick kemudian menjadikan kursi roda daapat bergerak  ke segala arah sehingga akan mempermudah pengguna menggerakkan kursi roda.

Turbin Savonius memiliki kontruksi yang sederhana sehingga mudah untuk dibuat. Kelemahan Turbin Savonius konvensional adalah terdapat torsi negatif akibat adanya sudu yang berputar berlawanan arah aliran. Torsi negatif dapat dikurangi dengan menempatkan pelat lengkung di bagian depan turbin. Adapun tujuan dari penelitian ini adalah menganalisis penggunaan deflektor pelat lengkung terhadap performa turbin air sumbu vertikal Savonius dua sudu. Penelitian dilakukan dengan memvariasikan kelengkungan deflektor, yaitu 1/4 lingkaran, 3/8 lingkaran dan 1/2 lingkaran secara eksperimen. Hasil pengujian menunjukkan bahwa penambahan deflektor pelat lengkung meningkatkan performa turbin dibandingkan tanpa menggunakan deflektor. Dari ketiga variasi deflektor, deflektor 1/4 lingkaran memiliki performa tertinggi dengan daya yang dihasilkan adalah 0,266 Watt dan koefisien daya sebesar 0,169 pada putaran 113 rpm.